From patchwork Thu Mar 26 07:59:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miao-chen Chou X-Patchwork-Id: 11459489 X-Patchwork-Delegate: marcel@holtmann.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B470B15AB for ; Thu, 26 Mar 2020 08:00:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8131C20719 for ; Thu, 26 Mar 2020 08:00:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="NapyBqTn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727854AbgCZH7z (ORCPT ); Thu, 26 Mar 2020 03:59:55 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:37092 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727851AbgCZH7w (ORCPT ); Thu, 26 Mar 2020 03:59:52 -0400 Received: by mail-pl1-f193.google.com with SMTP id x1so1837828plm.4 for ; Thu, 26 Mar 2020 00:59:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=d3vBOF1WIUmdx5diIlqq5HiBjmrSSvAByjzTDruCL+A=; b=NapyBqTnh4Jhz4C8q6SrjI4PczVGvEBdAwIbyz6kSqc71aRDwcC5mrYiDYHVIGFFak gKP3ttl50ZKni+ffkOxAqMdnE8wC5ZGB4nThKQSJmjZCPH1y8XTNjp+aCmx87jv7HI2o Gz+PlXmqmZUh5NB+QXMflLET79ZfnlessY6Bs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=d3vBOF1WIUmdx5diIlqq5HiBjmrSSvAByjzTDruCL+A=; b=gjUc+6OgZSxabb0wQkOM7FjsEAyGQ5XORWQrqZAzRpvkiYVem0dv0YSe7dVz0Tq10X m0jw/hJHqwI0YTrIBuPuC5k9WHK9MVOTV1ERBAR8uXnB0bEuFXv4c8GkWV/71BC2M8mb 3JYSQq90ruFdN0+ffh56wK1nksaz8e2tjb0PjNKTUsfMJnTEgCuEfyJT3/iyjkYtrBzC UDINftHKtWZqwfBqoYFunokbFCyx2v73GhjFNVLOtq52WzYvyoA8dD9d/69LbZdG33zv Zy/9aPi5qs5hHn3BRyIGERIHbLTAAibJ8/YzHOh/4+a8DtEqexGayozw7bGQtALWK9MP rd+g== X-Gm-Message-State: ANhLgQ2cEpljArjcCeeQtMZcWRCIT6Zjo6124Lgq7hLfx6PfBMeLYvEu hzp1euKKajhBV790yucJnVRXG3Mm3zk= X-Google-Smtp-Source: ADFU+vuELIYqUH6/PfhgFASn/9qiCLg/598xvv/TNS46XAS8vE0QYYoJQuqG0JmKPiP2kMaEitu8rw== X-Received: by 2002:a17:90a:a102:: with SMTP id s2mr1746406pjp.46.1585209590821; Thu, 26 Mar 2020 00:59:50 -0700 (PDT) Received: from mcchou0.mtv.corp.google.com ([2620:15c:202:201:b46:ac84:1014:9555]) by smtp.gmail.com with ESMTPSA id 8sm1036476pfv.65.2020.03.26.00.59.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Mar 2020 00:59:50 -0700 (PDT) From: Miao-chen Chou To: Bluetooth Kernel Mailing List Cc: Marcel Holtmann , Alain Michaud , Luiz Augusto von Dentz , Miao-chen Chou , "David S. Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v3 2/2] Bluetooth: btusb: Read the supported features of Microsoft vendor extension Date: Thu, 26 Mar 2020 00:59:38 -0700 Message-Id: <20200326005931.v3.2.I4e01733fa5b818028dc9188ca91438fc54aa5028@changeid> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200326075938.65053-1-mcchou@chromium.org> References: <20200326075938.65053-1-mcchou@chromium.org> MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This adds a new header to facilitate the opcode and packet structures of vendor extension(s). For now, we add only the HCI_VS_MSFT_Read_Supported_Features command from Microsoft vendor extension. See https://docs.microsoft.com/en-us/windows-hardware/drivers/ bluetooth/microsoft-defined-bluetooth-hci-commands-and-events# microsoft-defined-bluetooth-hci-events for more details. Upon initialization of a hci_dev, we issue a HCI_VS_MSFT_Read_Supported_Features command to read the supported features of Microsoft vendor extension if the opcode of Microsoft vendor extension is valid. See https://docs.microsoft.com/en-us/windows-hardware/drivers/ bluetooth/microsoft-defined-bluetooth-hci-commands-and-events# hci_vs_msft_read_supported_features for more details. This was verified on a device with Intel ThunderPeak BT controller where the Microsoft vendor extension features are 0x000000000000003f. Signed-off-by: Miao-chen Chou --- Changes in v3: - Introduce msft_vnd_ext_do_open() and msft_vnd_ext_do_close(). net/bluetooth/hci_core.c | 95 ++++++++++++++++++++++++++++++++++++++++ net/bluetooth/msft.c | 27 ++++++++++++ 2 files changed, 122 insertions(+) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 286294540bed..1062692e8612 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1408,6 +1408,87 @@ static void hci_dev_get_bd_addr_from_property(struct hci_dev *hdev) bacpy(&hdev->public_addr, &ba); } +static void process_msft_vnd_ext_cmd_complete(struct hci_dev *hdev, + struct sk_buff *skb) +{ + struct msft_cmd_cmp_info *info = (void *)skb->data; + struct msft_vnd_ext *msft_ext = (struct msft_vnd_ext *)hdev->msft_ext; + const u8 status = info->status; + const u16 sub_opcode = __le16_to_cpu(info->sub_opcode); + + skb_pull(skb, sizeof(*info)); + + if (IS_ERR(skb)) { + bt_dev_warn(hdev, "Microsoft extension response packet invalid"); + return; + } + + if (status) { + bt_dev_warn(hdev, "Microsoft extension sub command 0x%2.2x failed", + sub_opcode); + return; + } + + bt_dev_dbg(hdev, "status 0x%2.2x sub opcode 0x%2.2x", status, + sub_opcode); + + switch (sub_opcode) { + case MSFT_OP_READ_SUPPORTED_FEATURES: { + struct msft_rp_read_supported_features *rp = (void *)skb->data; + u8 prefix_len = rp->evt_prefix_len; + + msft_ext->features = __le64_to_cpu(rp->features); + msft_ext->evt_prefix_len = prefix_len; + msft_ext->evt_prefix = kmalloc(prefix_len, GFP_ATOMIC); + if (!msft_ext->evt_prefix) { + bt_dev_warn(hdev, "Microsoft extension invalid event prefix"); + return; + } + + memcpy(msft_ext->evt_prefix, rp->evt_prefix, prefix_len); + bt_dev_info(hdev, "Microsoft extension features 0x%016llx", + msft_ext->features); + break; + } + default: + bt_dev_warn(hdev, "Microsoft extension unknown sub opcode 0x%2.2x", + sub_opcode); + break; + } +} + +static bool msft_vnd_ext_supported(struct hci_dev *hdev) +{ + struct msft_vnd_ext *msft_ext = (struct msft_vnd_ext *)hdev->msft_ext; + + return msft_ext->opcode != HCI_OP_NOP; +} + +static void msft_vnd_ext_do_open(struct hci_dev *hdev) +{ + struct sk_buff *skb; + struct msft_vnd_ext *msft_ext = (struct msft_vnd_ext *)hdev->msft_ext; + struct msft_cp_read_supported_features cp; + + msft_ext->features = 0; + msft_ext->evt_prefix_len = 0; + msft_ext->evt_prefix = NULL; + + if (!msft_vnd_ext_supported(hdev)) + return; + + cp.sub_opcode = MSFT_OP_READ_SUPPORTED_FEATURES; + skb = __hci_cmd_sync(hdev, msft_ext->opcode, sizeof(cp), &cp, + HCI_CMD_TIMEOUT); + + process_msft_vnd_ext_cmd_complete(hdev, skb); + + if (skb) { + kfree_skb(skb); + skb = NULL; + } +} + static int hci_dev_do_open(struct hci_dev *hdev) { int ret = 0; @@ -1555,6 +1636,8 @@ static int hci_dev_do_open(struct hci_dev *hdev) } } + msft_vnd_ext_do_open(hdev); + /* If the HCI Reset command is clearing all diagnostic settings, * then they need to be reprogrammed after the init procedure * completed. @@ -1685,6 +1768,16 @@ static void hci_pend_le_actions_clear(struct hci_dev *hdev) BT_DBG("All LE pending actions cleared"); } +static void msft_vnd_ext_do_close(struct hci_dev *hdev) +{ + struct msft_vnd_ext *msft_ext = (struct msft_vnd_ext *)hdev->msft_ext; + + msft_ext->features = 0; + msft_ext->evt_prefix_len = 0; + kfree(msft_ext->evt_prefix); + msft_ext->evt_prefix = NULL; +} + int hci_dev_do_close(struct hci_dev *hdev) { bool auto_off; @@ -1734,6 +1827,8 @@ int hci_dev_do_close(struct hci_dev *hdev) cancel_delayed_work_sync(&adv_instance->rpa_expired_cb); } + msft_vnd_ext_do_close(hdev); + /* Avoid potential lockdep warnings from the *_flush() calls by * ensuring the workqueue is empty up front. */ diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c index c7ede27095be..21cb32105206 100644 --- a/net/bluetooth/msft.c +++ b/net/bluetooth/msft.c @@ -20,6 +20,33 @@ // COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS // SOFTWARE IS DISCLAIMED. +#define MSFT_EVT_PREFIX_MAX_LEN 255 + struct msft_vnd_ext { __u16 opcode; + __u64 features; + __u8 evt_prefix_len; + __u8 *evt_prefix; }; + +struct msft_cmd_cmp_info { + __u8 status; + __u8 sub_opcode; +} __packed; + +/* Microsoft Vendor HCI subcommands */ +#define MSFT_OP_READ_SUPPORTED_FEATURES 0x00 +#define MSFT_FEATURE_MASK_RSSI_MONITOR_BREDR_CONN 0x0000000000000001 +#define MSFT_FEATURE_MASK_RSSI_MONITOR_LE_CONN 0x0000000000000002 +#define MSFT_FEATURE_MASK_RSSI_MONITOR_LE_ADV 0x0000000000000004 +#define MSFT_FEATURE_MASK_ADV_MONITOR_LE_ADV 0x0000000000000008 +#define MSFT_FEATURE_MASK_VERIFY_CURVE 0x0000000000000010 +#define MSFT_FEATURE_MASK_CONCURRENT_ADV_MONITOR 0x0000000000000020 +struct msft_cp_read_supported_features { + __u8 sub_opcode; +} __packed; +struct msft_rp_read_supported_features { + __u64 features; + __u8 evt_prefix_len; + __u8 evt_prefix[0]; +} __packed;